curl --request POST \
  --url https://futures.kraken.com/derivatives/api/v3/cancelallorders \
  --header 'APIKey: <api-key>' \
  --header 'Authent: <api-key>'

import requests

url = "https://futures.kraken.com/derivatives/api/v3/cancelallorders"

headers = {
    "APIKey": "<api-key>",
    "Authent": "<api-key>"
}

response = requests.post(url, headers=headers)

print(response.text)

const options = {method: 'POST', headers: {APIKey: '<api-key>', Authent: '<api-key>'}};

fetch('https://futures.kraken.com/derivatives/api/v3/cancelallorders', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://futures.kraken.com/derivatives/api/v3/cancelallorders"

	req, _ := http.NewRequest("POST", url, nil)

	req.Header.Add("APIKey", "<api-key>")
	req.Header.Add("Authent", "<api-key>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

{
  "result": "success",
  "cancelStatus": {
    "receivedTime": "2019-08-01T15:57:37.518Z",
    "cancelOnly": "all",
    "status": "cancelled",
    "cancelledOrders": [
      {
        "order_id": "6180adfa-e4b1-4a52-adac-ea5417620dbd"
      },
      {
        "order_id": "89e3edbe-d739-4c52-b866-6f5a8407ff6e"
      },
      {
        "order_id": "0cd37a77-1644-4960-a7fb-9a1f6e0e46f7"
      }
    ],
    "orderEvents": [
      {
        "type": "CANCEL",
        "uid": "89e3edbe-d739-4c52-b866-6f5a8407ff6e",
        "order": {
          "orderId": "89e3edbe-d739-4c52-b866-6f5a8407ff6e",
          "cliOrdId": null,
          "type": "post",
          "symbol": "PI_XBTUSD",
          "side": "buy",
          "quantity": 890,
          "filled": 0,
          "limitPrice": 10040,
          "reduceOnly": false,
          "timestamp": "2019-08-01T15:57:08.508Z",
          "lastUpdateTimestamp": "2019-08-01T15:57:08.508Z"
        }
      },
      {
        "type": "CANCEL",
        "uid": "0cd37a77-1644-4960-a7fb-9a1f6e0e46f7",
        "order": {
          "orderId": "0cd37a77-1644-4960-a7fb-9a1f6e0e46f7",
          "cliOrdId": null,
          "type": "lmt",
          "symbol": "PI_XBTUSD",
          "side": "sell",
          "quantity": 900,
          "filled": 0,
          "limitPrice": 10145,
          "reduceOnly": true,
          "timestamp": "2019-08-01T15:57:14.003Z",
          "lastUpdateTimestamp": "2019-08-01T15:57:14.003Z"
        }
      }
    ]
  },
  "serverTime": "2019-08-01T15:57:37.520Z"
}